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Eventhough ofdm has high PAPR why should we use that in downlink?

+2 votes
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Eventhough ofdm has high PAPR why should we use that in downlink?
posted Jan 2, 2018 by anonymous

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1 Answer

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Hi,

As per my understanding , OFDMA has a benefit of maintaining orthogonality between carrier so it is used in the DL,PAPR is having only an power issue but that will not cause problem for eNB .even we have some techniques to reduce PAPR (like partial transmit sequence etc ,.)

answer Jan 3, 2018 by Himani
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+1 vote

PAPR is the major disadventage of OFDMA which require high resolution D/A and A/D or increasing Transmission Power.
I know that SC-FDMA used on Uplink becuase it has lower PAPR than OFDMA. On downlink direction, the high PAPR Problem of OFDMA solved by increasing eNB transmission power. This solution cannot be implemented on Uplink direction because UL is power limited link. so SC-FDMA used on UL instead of OFDMA, but why? why SC-FDMA has LOWER PAPR

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